/sci/ - Science & Math » Thread #14180152

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Anonymous Thu 03 Feb 01:22:29 2022 No.14180152 View Reply Original Report

Quoted By: >>14180221 >>14180492

Hi /sci/ I come to you with a question;

If I have a heat source that is 500c and I have an object interacting with the heat source that is 1kg of Iron. How hot can the piece of iron get? Can it become hotter than 500c? If so, why. If not, why not?

Lets assume for the sake of the question the heat source has 100% efficient heat transfer to the iron and that the iron is not being affected by any other source of heat. I think about this question all the time, I feel like the iron can get hotter than 500c and it confuses me a lot. How could something get hotter than a heat source heating it? Explain it like I have severe mental retardation.

Anonymous

Anonymous Thu 03 Feb 2022 01:36:44 No.14180221 Report

Quoted By: >>14180241

>>14180152
>If I have a heat source that is 500c and I have an object interacting with the heat source that is 1kg of Iron. How hot can the piece of iron get? Can it become hotter than 500c? If so, why. If not, why not?

It cannot unless the material in question has potential energy yet to be released that would result in a hotter flame.

>How could something get hotter than a heat source heating it?
Again "potential energy". Gasoline or thermite for instance doesn't need as hot of a flame/spark to ignite, but will continue to burn hotter then the initial ignition. Nuclear rods get hot and all they react with is each other. It is the type of material undergoing the reaction and how it reacts. Also the amount of oxygen will affect the temperature, increasing it or adding it in it's pure form will result in a hotter flame even if you don't increase the fuel (though technically oxygen is part of the fuel for a fire won't burn otherwise.

Anonymous

Anonymous Thu 03 Feb 2022 01:41:00 No.14180241 Report

Quoted By: >>14180257 >>14180348

>>14180221
That makes sense, but my feeling that things can get hotter than a heat source comes from the experience of getting into a car on a hot day. The door handle is too hot to touch, idk how hot that is, but it's definitely hotter than the sun or the air, how can my door handle become hotter than either of those things?

Anonymous

Anonymous Thu 03 Feb 2022 01:45:36 No.14180257 Report

Quoted By: >>14180282 >>14180348

>>14180241
I just realized it's not hotter than the sun, I meant it's hotter than the air which is being heated by the sun

Anonymous

Anonymous Thu 03 Feb 2022 01:53:50 No.14180282 Report

Quoted By: >>14180304 >>14180500

>>14180257
Most of sun photons move through the air without interacting with it. The very reason mass CO2 release is supposed to heat the atmosphere. Is that CO2 is better at interacting with sunlight.

Anonymous

Anonymous Thu 03 Feb 2022 01:59:32 No.14180304 Report

Quoted By: >>14180348

>>14180282
I see, so the door handle is capable of absorbing more of the energy than the air, which is why it's hotter? Thanks.

Anonymous

Anonymous Thu 03 Feb 2022 02:14:54 No.14180348 Report

Quoted By:

>>14180241
>That makes sense, but my feeling that things can get hotter than a heat source comes from the experience of getting into a car on a hot day.
Right. That's radiation from light. A similar thing is happening with nuclear energy too, it's not like the rods are actually on fire. Even with a camp fire most the heat may rise and leave through smoke and chemical reactions, but it has that infrared "radiant heat" coming from the light of the fire itself. That will warm you even if you aren't close to the actual fire.

>>14180257
>>14180304
The air is not as dense as the metal on a car door, the energy it receives from light can be lost rather than insulated by immobile atoms near it. This is also why the air won't cool it to its own temperature, it doesn't have the density/energy/conductive nature so it cannot pass its energy to it as fast as light can.

Anonymous

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Anonymous Thu 03 Feb 2022 03:28:59 No.14180492 Report

Quoted By: >>14180536

>>14180152
>If I have a heat source that is 500c
The heat source is not at 500 C. The heat source has an average temperature of 500 C.

If you have a heat source, like a resisting heating element, it will get as hot as it can get before it melts. Even if you pass very little current through it, if it is properly insulated (whatever that means), its temperature will rise until it melts. This would assume perfect isolation (floating in space surrounded by mirrors which perfectly reflect all wavelengths, which isn't possible) but that's where the retard intuition of yours is getting the idea.

Using electricity may be cheating, but it gets the job done to prove your intuition. There are many example which would not work, like using a flame. The iron would not reach a higher temperature than the flame's temperature--once the iron became the flame's temperature, the flame is room-temperature relative to the flame, there is no further heat transfer.

Electrons are cheating.

Anonymous

Anonymous Thu 03 Feb 2022 03:31:53 No.14180500 Report

Quoted By:

>>14180282
>Is that CO2 is better at interacting with sunlight.
No, CO2 is good at interacting with the light emitted by the earth as a blackbody. If CO2 was really good at interacting with sunlight it would have a net cooling effect

Anonymous

Anonymous Thu 03 Feb 2022 03:50:15 No.14180536 Report

Quoted By:

>>14180492
>if it is properly insulated (whatever that means)
heat spreads through light
mirrors reflect light

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